Still being produced today, egg cups can range from inexpensive to big dollar prices. What it was made of and if there is a pattern on the piece are only two for the factors that drive the price of it.
There are quite a few different categories that these fall into. Art Deco, Black Memorabilia, Personalities (like a certain actor), Souvenir Ware (like advertising a city you have been to), and Staffordshireware are just a small portion that egg cups can fall into.
Those that date prior to 1840 are quite scarce, as are the character cups of the 1930's.
Do you happen to have a really cool example of an egg cup in your collection?
|*image courtesy of Wikipedia.com|